The Houthi attacks, in what they call a bid to support Palestinians in the war with Israel, have disrupted trade on the main East-West route that makes up about 12% of global shipping traffic.
On Monday, the Houthi movement vowed to widen its targets in the Red Sea region to U.S. ships, following U.S. and British strikes on its sites in Yemen.
LNG tanker Al Rekayyat has resumed sailing through the Red Sea and is heading to Qatar, the data showed, after having been stopped since Jan. 13 along its Red Sea route.
The vessels Al Ghariya, Al Huwaila and Al Nuaman, loaded with Qatari LNG, were also on the move, but had changed course to head south even though they are still signalling the Suez Canal as their destinations, the data showed.
Qatari LNG cargoes transiting Suez are typically headed for Europe. The three tankers had stopped off the coast of Oman since Jan. 14. The estimated time of arrival for the Al Nuaman has also been delayed for more than two weeks to Feb. 4 from Jan. 19, the data showed.
QatarEnergy did not immediately respond to requests for comment outside official business hours.
Shipowners and managers of the four vessels, including Teekay Shipping Glasgow, Pronav Ship Management and Nakilat Shipping Qatar Ltd did not immediately respond to requests for comment.
Shell, which owns shipping and chartering arm STASCO, manager of the Al Nuaman, declined to comment.
Vessels have been pausing or diverting from the Red Sea that leads to the Suez Canal, the fastest route for freight from Asia to Europe.
LNG vessels are among the many ships forced to take the longer route around Africa via the Cape of Good Hope instead.
Analysts estimate Cape of Good Hope route could add about nine days to the 18-day voyage from Qatar. A longer route would result in delivery delays, but gas storage levels in Europe are healthy.
Front-month European benchmark gas prices on the Dutch TTF hub eased on Monday, as milder weather forecasts and well-filled storage helped offset shipping concerns.
QatarEnergy, the world’s second largest LNG exporter, has stopped sending tankers via the Red Sea although production continues, a senior source with direct knowledge of the matter told Reuters on Monday.